package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.properties.WeChatProperties;
import com.sky.mapper.UserMapper;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.WeChatPayUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    
    @Autowired
    UserMapper  userMapper;
    
    
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    private final WeChatPayUtil weChatPayUtil;
    private final WeChatProperties weChatProperties;

    public UserServiceImpl(WeChatPayUtil weChatPayUtil, WeChatProperties weChatProperties) {
        this.weChatPayUtil = weChatPayUtil;
        this.weChatProperties = weChatProperties;
    }

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxlogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空,如果为空表示登入失败,抛出业务异常
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user= userMapper.getByOpenid(openid);

        //如果是新用户,自动完成注册
        if (user==null){
           user = User.builder()
                    .openid(openid)//这里怎么能使user调用getOpenid呢 user这里 是null啊
                    .createTime(LocalDateTime.now())
                    .build();
           userMapper.insert(user);
        }

        //返回这个用户

        return user;
    }

    private String getOpenid(String code) {
        //调用微信接口服务,获得当前微信用户的openid

        Map<String, String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        //由于返回来的是json,所以得解析一下
        JSONObject jsonObject = JSON.parseObject(json);

        //获得返回来的json结构中的选择获取其中的一个js_code 的openid
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
